Caitlin Narcissa Malfoy (b. 22 September 2007) is the fanmade daughter of Draco Malfoy and Astoria Greengrass. She has an older brother named Scorpius Malfoy and one aunt from her mother's side named Daphne Greengrass She went to Hogwarts School of Witchcraft and Wizardry from the year 2018 onwards and was sorted into the house of Slytherin.

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Caitlin Narcissa Malfoy was born unto Draco Malfoy and Astoria Greengrass in the Malfoy Manor on the date September 22, 2007. When Astoria was pregnant with her, she knew something went wrong. Her baby, like her mother's family, was cursed by Lord Voldemort. This caused the baby to have an evil spirit inside of her. When she was finally born, Astoria chose the name Caitlin because it meant "pure". Astoria wanted this name to show that the Malfoy-Greengrass family were proud pure-bloods.

Caitlin had the opposite personality of her brother Scorpius meaning she was vile and cruel. Even though Caitlin was vain, she would act kind and innocent around her parents and the Hogwarts faculty. She was more like her father than her mother hence being the school "bully." When her Hogwarts letter arrived she was very nervous. Scorpius said it was exciting, but she felt anxious and even scared to go.

Caitlin was sorted into Slytherin at the age of eleven. Everyone but Albus Severus Potter and Rose Weasley, who were leaning against the doorway, applauded for her. The cousins both knew that there was something suspicious about Caitlin. Soon she was pretending to be kind to Rose and befriends her. The Malfoy spawn was secretly making a plan to destroy Rose's reputation. She also despised her older brother being with Rose and Albus which was getting in the way of her plan. In addition, she noticed a love connection between Scorpius and Rose. She knew the Malfoy and Weasley clans were never supposed to be together. This made her furious. She argued with Scorpius about his relationship with Rose and ended it by threatening to "finish" her, When she found Rose reading in the Astrology Tower, Caitlin asked her what it was like being with her older brother. Rose explained that it was amazing and he made her life complete. The sneaky blonde then asked her about the downsides of it. Rose was upset when she was questioned this. She started to cry when she told her so-called friend that she and Scorpius weren't supposed to be in love with each other since their families were enemies.

Rose started to get angry at her family wondering why Scorpius was so bad in their eyes. Her parents, Hermione Granger and Ronald Weasley, told her their childhood story about them and Draco. Rose started to quarrel with the two saying that she loves Scorpius and that was all that mattered. She and Hermione began to fight majorly. It was so severe that they had a duel with their wands. Ron and Rose's younger brother, Hugo Weasley, tried to stop them, fearing they could get injured or killed. Rose then could not take it anymore. All her rage came out of her and used the forbidden Avada Kedvra curse on Hermione. Ron and Hugo tried to come to her rescue, but it was too late. She had died. Rose couldn't believe what she had done. Her father and brother were crying next to her mother's corpse. Her oldest child came running over until Ron stopped her. He asked his daughter what she had done. Rose apologized through her tears, but he had not accepted it. Hugo said he would get help from Azkaban as Ron mourned for his beloved wife.

Caitlin: "Friends? Ha! Now I can see why you weren't chosen to be a Ravenclaw!"

— Caitlin making fun of Rose in the woods

Rose ran through the sad crowd of wizards and witches into a nearby forest to hide. Soon, a hiss of a snake was heard. She turned around to see a viper behind her. It seemed to be chuckling. Then, it formed into a young girl. It was Caitlin. Rose told her that she was puzzled, then stumbled over her words. Caitlin began to sneer and tease her. Rose then realized that her "friend" wanted her to kill Hermione, but she asked aloud that she thought they were friends. The girl mocked her by giving notice that she wasn't in Ravenclaw, meaning she wasn't smart enough to know that Caitlin was evil, as wisdom is a Ravenclaw trait. Then Rose took out her wand and warned her to be careful of what she says. The trickster quickly thought of her plan, used her own wand to use an unnamed spell on her, which was just a small blast from it, and Rose was suddenly knocked unconscious.

At Hogwarts, everyone was quiet. The Weasleys and the Potters were scared, sad, and worried. Many students asked Caitlin if she knew anything about this, but she lied and said no. Hugo, Scorpius, Albus, and Lily were all sobbing. She told them she was "sorry" for what happened. Scorpius was tempestuous at his younger sister for doing such a terrible thing.

In her Charms class, Caitlin was looking from left to right, making sure nobody would look at her. Then she heard a whisper from Roxanne Weasley, a fellow Slytherin. Roxanne angrily told her that she knew what she had done. Caitlin darted her head to the young witch. Roxanne was silent for a moment. She gave Caitlin a piece of paper. It read, "Meet me in the Quidditch field after class. I know what you're up to." Soon enough, she made her way to the field. She saw Roxanne there with a fierce glare. She snatched out her wand and pointed it directly at her. She stopped in the middle of her spell because Caitlin was running towards her. They both started to beat each other. Just then, Caitlin saw Roxanne's wand on the ground. She stealthily grabbed it, shoved her, and yelled, "SECTUMSEMPRA!" The Weasley tumbled. Caitlin smugly came upon her. She asked if she learned her lesson. Roxanne stammered, but no words came out. She threw the wand in the patch of grass near her victim and happily skipped away.

As Caitlin was in the halls, she saw nurses carrying the wounded Roxanne. She started to go about her business until Professor Minerva McGonagall was in her way. Motioning Caitlin to follow her outside the school, she explained that she had received "horrifying" news. The troublemaker acted nonchalant as McGonagall said Lily Potter told her that she saw Caitlin fighting with Lily's cousin, Roxanne Weasley. Caitlin answered with a mere stutter. The Hogwarts Headmistress cut her off by stating that it was true since she didn't answer right away. Then Caitin immaturely replied that Roxanne started it. McGonagall, losing her temper, said that it didn't matter who started the fight and that she was only worried about the fact she nearly killed one of her fellow Slytherins. Caitlin remained silent. McGonagall then explained that the consequence for that was one hundred points from Slytherin and detention for her after school. She morphed into a cat and scurried away. Caitlin, snapping out of her despicable thoughts, muttered to herself that Lily was going to be "in for a surprise."

The next day arrived, and Caitlin was in the library shelving books. Some Slytherins were unhappy with her since she was caused the loss of one hundred house points. She pretended to act natural, but that made them suspicious. In her mind, it was fine for them to be suspicious because when nobody was looking, she was plotting her revenge for Lily. She was testing out hexes and jinxes from a spellbook to destroy Lily behind bookshelves.

In the middle of the night, Caitlin got out of her dorm and noticed Lily, her current prey, in the lavatory washing her hands. With her wand, Caitlin used the Biwitched Sleeping Spell on Lily and carried her behind Hogwarts. She was easy to carry since she was a year below her, as Caitlin mumbled. She then saw a giant mud puddle, broke the spell, and dropped Lily in it. She awoke with a splash and noticed Caitlin towering over her. She jumped into the mud and rolled Lily around in it. She struggled to get out, but Caitlin kept on pushing her in the murky, wet soil. Just then, Caitlin felt a third person's presence as heard a distant voice. The voice belonged to one person and one person only: Scorpius. Lily screamed for help. He saw the two enemies, broke up the fight, and helped Lily get out. He asked Lily if that girl was the one who caused this. She answered back that it was Caitlin. Lowering his voice so Lily couldn't hear, he whispered that first she has Rose kill her mother and put her in Azkaban, beat up Roxanne while she was just trying to protect her family, and now drench Lily in mud just because she told Professor McGonagall what she did to Roxanne. He told her that Lily was doing a good deed and that she needed to lose house points and have detention. Caitlin stood there, speechless. Her brother resumed that he was going to tell everyone about the ordeal. Scorpius walked with a limping Lily inside the school leaving his sister alone in the dark. She later had a year-long punishment which was cleaning all the house common rooms daily.

It was now 2021, and everybody was excited for the Slug Club Christmas Party. Caitlin was ecstatic too. She couldn't wait to show off her beautiful gown to all the ones who doubted her. On the night of the party, Caitlin looked at herself in her mirror one last time before she made her grand entrance. Suddenly, she forgot that she didn't have a date. She ended the problem by thinking, that she will just see if anyone wanted to dance with her. As everyone was talking with each other, their heads suddenly turned towards the blonde haired figure in a jewel-sprinkled gown walking slowly down the stairs. An anonymous wizard whispered to his friend if he agreed that Caitlin looked beautiful. His friend, also anonymous, said back that Caitlin Malfoy was a unforgivable sinner and told him to remember what she had done to Lily Potter. Caitlin simply ignored them. She had the urge to demand a dance from someone, male or not. Then, she grabbed the hand of the boy who said that she was gorgeous and began to waltz in the middle of the room The young wizard, obvious enough, was lovestruck.